Self cleaning cat litter box



FIG. 1 is a perspective view taken from the top, front and left side of a self cleaning cat litter box showing my new design;

FIG. 2 is a rear elevational view thereof;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a right side elevational view thereof; and

FIG. 5 is a bottom plan view thereof. 

The ornamental design for a self cleaning cat litter box, as shown and described. 